New Journal of Physics
New Journal of Physics
5 years ago

Designing Kerr interactions using multiple superconducting qubit types in a single circuit

Designing Kerr interactions using multiple superconducting qubit types in a single circuit
The engineering of Kerr interactions is of great interest for processing quantum information in multipartite quantum systems and for investigating many-body physics in a complex cavity-qubit network. We study how coupling multiple different types of superconducting qubits to the same cavity modes can be used to modify the self- and cross-Kerr effects acting on the cavities and demonstrate that this type of architecture could be of significant benefit for quantum technologies. Using both analytical perturbation theory results and numerical simulations, we first show that coupling two superconducting qubits with opposite anharmonicities to a single cavity enables the effective self-Kerr interaction to be diminished, while retaining the number splitting effect that enables control and measurement of the cavity field. We demonstrate that this reduction of the self-Kerr effect can maintain the fidelity of coherent states and generalised Schrödinger cat states for much longer than typ...

Publisher URL: http://iopscience.iop.org/1367-2630/20/2/023037

DOI: 10.1088/1367-2630/aa9243

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